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fix: 可抛算术比较位 opcode 纯标翻转，DCE 不再删副作用指令

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彭俊皓
2026-09-27 01:28:49 +00:00
parent f8722ca91d
commit 18737c70ea
5 changed files with 72 additions and 75 deletions
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crates/oxide_dce/src/iter_sweep.rs
+5 -7
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@@ -107,13 +107,12 @@ mod tests {
use oxide_ir::inst::Inst;
use oxide_ir::operand::Operand;
/// 线性死链：LOAD_CONST→ADD→结果丢弃，全删（剩 RETURN）。
/// 线性死链：LOAD_CONST→MOV→结果丢弃，全删（剩 RETURN）。
#[test]
fn linear_dead_chain_deleted() {
let mut f = IRFunction::new();
f.insts.push(Inst::load_const(Operand::Reg(0), 0)); // 0: r0 = const
f.insts
.push(Inst::new(OpCode::ADD, Operand::Reg(1), Operand::Reg(0), Operand::Reg(0))); // 1: r1 = r0 + r0
f.insts.push(Inst::inst_mov(Operand::Reg(1), Operand::Reg(0))); // 1: r1 = r0
f.insts
.push(Inst::new(OpCode::RETURN, Operand::Reg(2), Operand::None, Operand::None)); // 2: return r2
let mut keep = vec![true; f.insts.len()];
@@ -175,13 +174,12 @@ mod tests {
assert_eq!(keep, vec![false, true], "死 CREATE_CLOSURE 删，RETURN 保留");
}
/// 连锁迭代：写链 LOAD_CONST→ADD→LOAD_CONST 全死，逐轮删除至不动点。
/// 连锁迭代：写链 LOAD_CONST→MOV→LOAD_CONST 全死，逐轮删除至不动点。
#[test]
fn chained_dead_writes_deleted_iteratively() {
let mut f = IRFunction::new();
f.insts.push(Inst::load_const(Operand::Reg(0), 0)); // 0: r0（ADD 读，轮 2 删）
f.insts
.push(Inst::new(OpCode::ADD, Operand::Reg(1), Operand::Reg(0), Operand::Reg(0))); // 1: r1（轮 1 删）
f.insts.push(Inst::load_const(Operand::Reg(0), 0)); // 0: r0（MOV 读，轮 2 删）
f.insts.push(Inst::inst_mov(Operand::Reg(1), Operand::Reg(0))); // 1: r1（轮 1 删）
f.insts.push(Inst::load_const(Operand::Reg(2), 2)); // 2: r2 无人读（轮 1 删）
f.insts
.push(Inst::new(OpCode::RETURN, Operand::Reg(5), Operand::None, Operand::None)); // 3